RSRH explains that God’s Will never changes. As it says in Bamidbar 23:19 לא איש קל ויכזב, ובן אדם ויתנחם – God is not a man, who changes His mind.
Hirsch explains:
God doesn’t change His mind on His own account. He is caused to change his mind in response to external circumstances. (This change is in order to facilitate the same original intention, but now, due to the need, adjusted to bring that original intention about in a new way. Man will now move towards the same goal on a new stage.
King Saul failed and there the verse says He changed the Divine mandate for Saul’s family to remain kings.
In Shemos 32:14 God changed his decree from bad to good in response to prayer. (וינחם על הרעה)
But God’s Will doesn’t change. As the sages explain in Sanhedrin 98a, לא זכו, בעתה – Should it come to be that His people do not repent, God will still bring about the redemption.
Beraishis 6:6
pages 169-170
